S2.1 修复图像小程序（简单版）

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用OpenCV自带的inpaint()演示

CV_EXPORTS_W void inpaint( 
    InputArray src, 
    InputArray inpaintMask,
    OutputArray dst, 
    double inpaintRadius, 
    int flags 
);

• src 输入图像
• inpaintMask 掩膜，和输入矩阵相同size的黑白矩阵。白色表示感兴趣区域。这里指需要修复的区域。
• dst 输出图像
• inpaintRadius 是渲染半径，一般用小半径3，大半径容易模糊。
• flags 修复方法，有两种：INPAINT_NS 和 INPAINT_TELEA。

#include <opencv2/opencv.hpp>
using namespace cv;
int main()
{
    Mat src = imread("images/favorite/cat.jpg");
    Mat dst;

    Rect rect0(624, 655, 400, 20);//这里的参数是我手动修改凑出来的

    Mat mask = Mat::zeros(src.size(), CV_8UC1);
    mask(rect0).setTo(255);

    inpaint(src, mask, dst, 3, INPAINT_NS);

    imshow("mask", mask);
    imshow("src", src);
    imshow("dst", dst);

    waitKey(0);
    return 0;
}

画图程序

创建鼠标回调函数

CV_EXPORTS void setMouseCallback(const String& winname, MouseCallback onMouse, void* userdata = 0);

#include <opencv2/opencv.hpp>

using namespace cv;

Mat mask_board;
int width = 5;
int paint_or_wipe = 1;

void draw_dot(int event, int x, int y, int flags, void *ustc)
{
    Scalar color;
    if(paint_or_wipe)
        color = (255);
    else
        color = (0);
    if(event == EVENT_LBUTTONDOWN)
        rectangle(mask_board, Point(x-width/2, y-width/2), Point(x+width/2, y+width/2), color, -1);
    if(event == EVENT_MOUSEMOVE and flags == EVENT_FLAG_LBUTTON)
        rectangle(mask_board, Point(x-width/2, y-width/2), Point(x+width/2, y+width/2), color, -1);
}

int main()
{
    Mat src = imread("images/favorite/cat.jpg");
    mask_board = Mat::zeros(src.size(), CV_8UC1);

    imshow("mask_board", mask_board);
    setMouseCallback("mask_board", draw_dot);
    int k = 1;
    createTrackbar("paint_or_wipe", "mask_board", &k, 1);

    while (1)
    {
        paint_or_wipe = k;

        imshow("mask_board", mask_board);

        if(waitKey(1) == 'q')
            break;
    }

    return 0;
}

做一个去除水印小工具

利用OpenCV自带的highgui来做一个小应用，支持用鼠标划出水印位置，然后除水印。

#include <opencv2/opencv.hpp>

using namespace cv;

Mat mask_board;
const int width = 7;
int paint_or_wipe = 1;
int show = 1;

void draw_dot(int event, int x, int y, int flags, void *ustc)
{
    Scalar color;
    if(paint_or_wipe)
        color = (255);
    else
        color = (0);
    if(event == EVENT_LBUTTONDOWN or (event == EVENT_MOUSEMOVE and flags == EVENT_FLAG_LBUTTON))
        rectangle(mask_board, Point(x - width / 2, y - width / 2), Point(x + width / 2, y + width / 2), color, -1);

}

int main()
{
    Mat src = imread("images/favorite/my.jpg");
    Mat dst;
    mask_board = Mat(src.size(), CV_8UC1, Scalar(0));

    imshow("image", src);
    setMouseCallback("image", draw_dot);
    createTrackbar("paint_or_wipe", "image", &paint_or_wipe, 1);
    createTrackbar("show", "image", &show, 1);

    while (1)
    {
        if(waitKey(1) == 'q')
            break;

        inpaint(src, mask_board, dst, 3, INPAINT_NS);
        if(!show)
            bitwise_and(src, Scalar(0, 0, 0), dst, mask_board);

        imshow("image", dst);
    }

    waitKey(0);
    return 0;
}

（完）